Question

what is endothermic change and exothermic change

Answer 1

Endothermic is in which energy is absorbed
Exothermic in which energy is released

Answer 2

hey mate ..
Exothermic reactions
These are reactions that transfer energy to the surroundings. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to get hotter. The temperature increase can be detected using a thermometer. Some examples of exothermic reactions are:
Burning
Neutralisation reactions between acids and alkalis
The reaction between water and calcium oxide
Endothermic reactions
These are reactions that take in energy from the surroundings. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to get colder. The temperature decrease can be detected using a thermometer. Some examples of endothermic reactions are:
Electrolysis

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